Medium and high dielectric constant low temperature co-fired ceramic material and preparation method thereof

Abstract

The invention relates to a medium and high dielectric constant low temperature co-fired ceramic material. According to the medium and high dielectric constant low temperature co-fired ceramic material, a ceramic principle phase comprises the following components: 15 to 35 percent of Nb2O5, 10 to 25 percent of ZnO, 10 to 25 percent of BaO, 10 to 20 percent of TiO2, 1 to 10 percent of ZrO2, 1 to 8 percent of Sm2O3, 0 to 5 percent of Al2O3 and the balance of La2O3; a fluxing material comprises the following components: 5 to 10 percent of SnO2, 5 to 10 percent of CuO, 5 to 10 percent of SiO2, 1 to 5 percent of B2O3, 0 to 5 percent of Al2O3 and 0 to 5 percent of LiF. A preparation method comprises the following steps of: 1) preparing a primary ceramic material mixture; 2) grinding for the first time; 3) calcining; 4) preparing ground mixed powder of a secondary fluxing material and a ceramic principle phase calcined material; 5) calcining again; and 6) grinding again. According to test results, the sintering temperature is reduced to 830-880 DEG C, and the sintering contractibility rate can be controlled to be 10 to 20 percent; and the dielectric constant regulating range is 35 to 55, the dielectric loss rate is reduced to be below 0.001 and the temperature coefficient of resonant frequency is -20 to 20 ppm, so the medium and high dielectric constant low temperature co-fired ceramic material can be used for manufacturing miniature high-capacity microwave devices.

Description

Technical field [0001] The invention relates to a dielectric ceramic material, in particular to a medium-high dielectric constant low-temperature co-fired ceramic material and a preparation method thereof. Background technique [0002] The electrical properties and process characteristics of the existing low-temperature cofired ceramics (LTCC) materials with medium and high dielectric constants (LTCC) need to be further improved. The following problems generally exist: 1) The sintering temperature is too high to achieve 900 Low temperature sintering below ℃; 2) The frequency temperature coefficient is large or the quality factor is low, which cannot meet the requirements of high-frequency devices; 3) The dielectric constant stability is poor and cannot meet the miniaturization requirements of high-frequency devices; 4) With silver electrodes The co-firing performance is not stable enough, and the co-firing performance is poor; 5) the preparation of the casting slurry is difficult...

AI Technical Summary

Problems solved by technology

[0002] The electrical properties and process characteristics of existing low-temperature cofired ceramics (LTCC) materials with medium and high dielectric constants need to be further improved, and the following problems generally exist: 1) The sintering temperature is too high, and it is difficult to achieve 900 Low temperature sintering below ℃; 2) The frequency temperature coefficient is large or the quality factor is low, which cannot meet the requirements of high-frequency devices; 3) The dielectric constant stability is poor, which cannot meet the miniaturization requirements of high-frequency devices; 4) It is compatible with silver electrodes The co-firing performance is not stable enough, and the co-firing performance is poor; 5) It is difficult to prepare the cast slurry, and the electromagnetic performance of the tape-cast raw ceramic tape decreases after co-firing; 6) The porcelain body is relatively brittle, and it is difficult to meet the strength requirements of the device, etc.

Images